Ever tried making your own backpacking gear? Don't be intimidated, there are a lot of places that sell a DIY kit or if you are daring enough, simply buy the fabric and pattern separately and alter the design to specifically suit your own needs.
The bag in the video weighs only 12 ounces. That is impressive!
Here's a site with more information on MYOG: http://www.ultralightbackpackingonline.info/diymyog.html